YASKAWA SI-P3 Technical Manual page 17

Output (Master Device → Drive)
Byte
0 Operation Command High Byte
1 Operation Command Low Byte
2 Frequency Reference High Byte
3 Frequency Reference Low Byte
4 MEMOBUS/Modbus Function Code
5 MEMOBUS/Modbus Starting Register Address High Byte
6 MEMOBUS/Modbus Starting Register Address Low Byte
7 MEMOBUS/Modbus Data Length
8 MEMOBUS/Modbus Data 1 High Byte
9 MEMOBUS/Modbus Data 1 Low Byte
10 Reserved
11 Handshaking Register
<1> Unit depends on the setting of o1-03 (Digital Operator Display Scaling). When the drive is operating in the V/f Control mode or Open loop vector for PM mode, the drive's output
frequency becomes the input data.
◆
MEMOBUS/Modbus Message Area
In this area, a MEMOBUS/Modbus message is transferred to the SI-P3 card, and the parameters in the drive can be set, read, and monitored. Up to
four data items can be written or read at one time.
Because the SI-P3 card edits the MEMOBUS/Modbus message internally and transfers it to the drive after receiving the message, more time is
required to return the message. Use the handshaking register to synchronize sending or receiving of the data between the PROFIBUS-DP master and
the SI-P3 card. For details on the handshaking register, refer to
Execute an Enter command to write a parameter to the drive. Execution of the Enter command validates the written data. For the details of the Enter
command. Refer to the Enter Command in Appendix C of the Technical Manual for the drive.
Note: Refer to the MEMOBUS/Modbus Data Table in Appendix C of the Technical Manual for the drive for a list of monitor data using the MEMOBUS/Modbus message
area.
Configuration of MEMOBUS/Modbus Command Message
■
Table 13 shows the configuration of MEMOBUS/Modbus command messages when the Extended Data 1 is selected.
Byte
16 Function code
17
Starting Resistor No.
18
19 Number of Data Items
20
Data 1
<1>
21
22
Data 2
<1>
23
24
Data 3
<1>
25
26
Data 4
<1>
27
28
29 Reserved
30
31 Handshaking Register
<1> Setting is needed only for the write command. Select 00H for the read command.
Configuration of MEMOBUS/Modbus Response Messages
■
Table 14 shows the configuration of MEMOBUS/Modbus response messages when the Extended Data 1 is selected.
Byte
16 Function code
YASKAWA ELECTRIC SIEP C730600 42A YASKAWA AC Drive-Option Card PROFIBUS-DP Technical Manual
Table 12 Extended Data 2 Register Map
Description
Handshaking Register on page
Table 13 MEMOBUS/Modbus Command Message
Name
MEMOBUS/Modbus command code:
03H: Read command (reading Drive internal data)
08H: Loop back
10H: Write command (writing data into the drive)
Other codes: Not supported.
Starting resistor No.
Sets the number of bytes to read or write (only 2, 4, 6, or 8 allowed)
Data word 1
Data word 2
Data word 3
Data word 4
Reserved
Refer to
Table 14 MEMOBUS/Modbus Response Messages
Name
MEMOBUS/Modbus response codes
00H: Waiting for response from drive
03H: Response to read operation
10H: Response to write operation
83H: Read command error
90H: Write command error
Other codes: Not supported.
Input (Drive → Master Device)
Byte
0 Drive Status High Byte
1 Drive Status Low Byte
2 Motor Speed High Byte
3 Motor Speed Low Byte
4 MEMOBUS/Modbus Function Code
5 MEMOBUS/Modbus Starting Register Address High Byte
6 MEMOBUS/Modbus Starting Register Address Low Byte
7 MEMOBUS/Modbus Data Length
8 MEMOBUS/Modbus Data 1 High Byte
9 MEMOBUS/Modbus Data 1 Low Byte
10 Reserved
11 Handshake Register
19.
Handshaking Register on page 19.
7 Conventional Formats
Description
<1>
<1>
Function
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
Function
17